Tether promised that 1 USDT would be backed by 1 USD, and they would always honor a 1:1 exchange rate. Now it turns out that USDT are not backed by USD, and Tether will not exchange between the two. You are reliant on third party exchange services, that don't guarantee the exchange rate.
Traditional banking services are hostile to crypto, so they cut off Tether's ability to trade in USD. And Tethers own interest (widespread use of USDT) is at odds with their inability to provide adequate backing USD. Exchanges all wanted more USDT to provide more liquidity, and so Tether just printed USDT without backing.
A crypto backed 1:1 by USD is a great idea, the trick is finding a way to actually guarantee the backing currency & exchange rate.
Traditional banking services are hostile to crypto, so they cut off Tether's ability to trade in USD. And Tethers own interest (widespread use of USDT) is at odds with their inability to provide adequate backing USD. Exchanges all wanted more USDT to provide more liquidity, and so Tether just printed USDT without backing.
A crypto backed 1:1 by USD is a great idea, the trick is finding a way to actually guarantee the backing currency & exchange rate.